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首页> 外文期刊>Fuel >Enhanced Hg~(2+) removal and Hg~0 re-emission control from wet fuel gas desulfurization liquors with additives
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Enhanced Hg~(2+) removal and Hg~0 re-emission control from wet fuel gas desulfurization liquors with additives

机译：添加剂对湿式燃气脱硫液中Hg〜（2+）的去除和Hg〜0的再排放控制得到增强

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摘要

Secondary atmospheric pollutions may result from wet flue gas desulfurization (FGD) systems caused by the reduction of Hg~(2+) to Hg~0. The present study employed three agents: Na_2S, 2,4,6-trimercaptotiazine, trisodium salt nonahydrate (TMT) and sodium dithiocarbamate (DTCR) to precipitate aqueous Hg~(2+) in simulated desulfurization solutions. The effects of the precipitator's dosing quantity, the initial pH value, the reaction temperature, the concentrations of Cl~- and other metal ions (e.g. Cu~(2+) and Pb~(2+)) on Hg~(2+) removal were studied. A linear relationship was observed between Hg~(2+) removal efficiency and the increasing precipitator's doses along with initial pH. The addition of chloride and metal ions impaired the Hg~(2+) removal from solutions due to the complexation of C1~- and Hg~(2+) as well as the chelating competition between Hg~(2+) and other metal ions. Based on a comprehensive comparison of the treatment effects, DTCR was found to be the most effective precipitating agent. Moreover, all the precipitating agents were potent enough to inhibit Hg~(2+) reduction as well as Hg° re-emission from FGD liquors. More than 90% Hg~(2+) was captured by precipitating agents while Hg~(2+) reduction efficiency decreased from 54% to just less than 3%. The additives could efficiently control the secondary Hg~0 pollution from FGD liquors.
机译：Hg〜（2+）还原为Hg〜0可能导致湿式烟气脱硫（FGD）系统造成二次大气污染。本研究采用三种试剂：Na_2S，2,4,6-三巯基噻嗪，三钠九水合物（TMT）和二硫代氨基甲酸钠（DTCR）在模拟脱硫溶液中沉淀Hg〜（2+）水溶液。沉淀剂的添加量，初始pH值，反应温度，Cl〜-和其他金属离子（例如Cu〜（2+）和Pb〜（2+））的浓度对Hg〜（2+）的影响去除进行了研究。 Hg〜（2+）的去除效率与除尘器剂量的增加以及初始pH值之间存在线性关系。由于C1〜-和Hg〜（2+）的络合以及Hg〜（2+）与其他金属离子之间的螯合竞争，氯化物和金属离子的加入会损害溶液中Hg〜（2+）的去除。 。根据治疗效果的全面比较，发现DTCR是最有效的沉淀剂。而且，所有沉淀剂的效力足以抑制Hg〜（2+）的还原以及FGD液中Hg°的再排放。超过90％的Hg〜（2+）被沉淀剂捕获，而Hg〜（2+）的还原效率从54％降低到不足3％。这些添加剂可以有效地控制烟气脱硫液中Hg〜0的二次污染。

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  • 来源
    《Fuel》 |2010年第12期|p.3613-3617|共5页
  • 作者

    Tingmei Tang; Jiang Xu; Rongjie Lu; Jingjing Wo; Xinhua Xu;

  • 作者单位

    Department of Environmental Engineering, Zhejiang University, Hangzhou 310027, PR China;

    rnDepartment of Environmental Engineering, Zhejiang University, Hangzhou 310027, PR China;

    rnDepartment of Environmental Engineering, Zhejiang University, Hangzhou 310027, PR China;

    rnDepartment of Environmental Engineering, Zhejiang University, Hangzhou 310027, PR China;

    rnDepartment of Environmental Engineering, Zhejiang University, Hangzhou 310027, PR China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    HG~(2+) removal; HG~0 re-emission; FGD liquors; precipitation;

    机译：HG〜（2+）去除;HG〜0重新发射;FGD酒;沉淀;

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